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Message-ID: <1262613649.6408.164.camel@laptop> Date: Mon, 04 Jan 2010 15:00:49 +0100 From: Peter Zijlstra <peterz@...radead.org> To: Arjan van de Ven <arjan@...radead.org> Cc: "Youquan,Song" <youquan.song@...ux.intel.com>, hpa@...or.com, tglx@...utronix.de, akpm@...ux-foundation.org, venkatesh.pallipadi@...el.com, suresh.b.siddha@...el.com, kent.liu@...el.com, chaohong.guo@...el.com, youquan.song@...el.com, linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org, "jens.axboe" <jens.axboe@...cle.com> Subject: Re: [PATCH]tickless: Fix tick nohz timer irq0 fail to increaase On Mon, 2010-01-04 at 04:36 -0800, Arjan van de Ven wrote: > > cause is that it is default to enable high resolution timer which > > will force to oneshot broadcast mode. > > using local apic in one shot mode is not a problem, I'd in fact call it > a feature... lapic yes, broadcast not so much. He mentioned he was using Nehelem-EX which is known broken in that it stops the lapic in deeper C states and thus reverts to HPET broadcast since there's not enough HPET timers to go around. Something like processor.max_cstate=2 should fix that IIRC. Jens ran into this on his shiny new box. Disabling nohz is funny indeed, one wonders why he does that. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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